ARLA/CLUSTER: Desde 1913 que não há registo de tantos dias sem manchas solares

[João Costa > CT1FBF]

Most Sunspot free days since 1913

It looks like 2019 will end the year with more days without Sunspots than
any year since 1913

Space weather reported on December 17 there have been 34 consecutive days
without Sunspots and a total of 271 spotless days in 2019.

Space Weather
https://spaceweather.com/

NOAA/NASA expect the Solar Cycle 24/25 minimum will occur in April 2020 +/-
6 months
https://www.swpc.noaa.gov/news/solar-cycle-25-forecast-update

The HF Link site has a useful chart showing years with most Sunspot free
days
http://hflink.com/solar/Spotless_Days_Historic
_2019DEC18.png
-------------- próxima parte ----------
Um anexo em HTML foi limpo...
URL: http://radio-amador.net/pipermail/cluster/attachments/20191219/443fcc26/attachment.html